<template>
  <el-select ref="select" :value="valueTitle" :clearable="clearable" :style="`width:100%`" @clear="clearHandle">
    <el-input
      v-if="filterable"
      v-model="filterText"
      class="selectInput"
      :placeholder="placeholder"
    />

    <el-option :value="valueTitle" :label="valueTitle" class="options">
      <el-tree
        id="tree-option"
        ref="selectTree"
        :accordion="accordion"
        :data="options"
        :props="props"
        :node-key="props.value"
        :default-expanded-keys="defaultExpandedKeys"
        :filter-node-method="filterNode"
        @node-click="handleNodeClick"
      />
    </el-option>
  </el-select>
</template>

<script>
export default {
  name: 'TreeSelect',
  // 设置绑定参数
  model: {
    prop: 'value',
    event: 'selected'
  },
  props: {
    /* 配置项 */
    props: {
      type: Object,
      required: false,
      default: () => {
        return {
          value: 'id', // ID字段名
          label: 'label', // 显示名称
          children: 'children' // 子级字段名
        }
      }
    },
    /* 选项列表数据(树形结构的对象数组) */
    options: {
      type: Array,
      required: false,
      default: () => { return [] }
    },
    /* 初始值 */
    value: {
      type: Number,
      required: false,
      default: () => { return null }
    },
    /* 可清空选项 */
    clearable: {
      type: Boolean,
      default: () => { return false }
    },
    filterable: {
      type: Boolean,
      default: () => { return false }
    },
    defaultExpandedKeys: { // 要设置 node-key="id"
      type: Array,
      default: () => { return [] }
    },
    /* 自动收起 */
    accordion: {
      type: Boolean,
      required: false,
      default: () => { return false }
    },
    placeholder: {
      type: String,
      required: false,
      default: () => { return '' }
    }
  },
  data() {
    return {
      filterText: '',
      valueId: this.value, // 初始值
      valueTitle: '',
      treeWidth: 'auto'
    }
  },
  watch: {
    value() {
      this.valueId = this.value
      // console.log('treeid:' + this.valueId)
      this.initHandle()
    },
    filterText(val) {
      this.$refs.selectTree.filter(val)
    }
  },
  mounted() {
    this.initHandle()
  },
  methods: {
    // 初始化值
    initHandle() {
      if (this.valueId && this.valueId !== '') {
        const curnode = this.$refs.selectTree.getNode(this.valueId)
        if (curnode) {
          // console.log('finded node:' + this.valueId)
          this.valueTitle = this.$refs.selectTree.getNode(this.valueId).data[this.props.label] // 初始化显示
          this.$refs.selectTree.setCurrentKey(this.valueId) // 设置默认选中
          this.defaultExpandedKeys = [this.valueId] // 设置默认展开
        }
      } else {
        this.valueTitle = ''
      }
      this.initScroll()
    },
    // 初始化滚动条
    initScroll() {
      this.$nextTick(() => {
        const scrollWrap = document.querySelectorAll('.el-scrollbar .el-select-dropdown__wrap')[0]
        const scrollBar = document.querySelectorAll('.el-scrollbar .el-scrollbar__bar')
        scrollWrap.style.cssText = 'margin: 0px; max-height: none; overflow: hidden;'
        scrollBar.forEach(function(ele) {
          ele.style.width = 0
        })
      })
    },
    // 切换选项,父页面要配getSelectTreeValue()方法
    handleNodeClick(node) {
      this.valueTitle = node[this.props.label]
      this.valueId = node[this.props.value]
      this.$emit('selected', this.valueId)
      this.$refs.select.blur() // close
    },
    // 清除选中
    clearHandle() {
      this.valueTitle = ''
      this.valueId = null
      this.clearSelected()
      this.$emit('selected', null)
    },
    /* 清空选中样式 */
    clearSelected() {
      const allNode = document.querySelectorAll('#tree-option .el-tree-node')
      allNode.forEach((element) => element.classList.remove('is-current'))
    },
    filterNode(value, data) {
      if (!value) return true
      return data.name.indexOf(value) !== -1
    }
  }
}
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
  .el-scrollbar .el-scrollbar__view .el-select-dropdown__item{
    height: auto;
    max-height: 274px;
    padding: 0;
    overflow: hidden;
    overflow-y: auto;
  }
  .el-select-dropdown__item.selected{
    font-weight: normal;
  }
  ul li >>>.el-tree .el-tree-node__content{
    height:auto;
    padding: 0 20px;
  }
  .el-tree-node__label{
    font-weight: normal;
  }
  .el-tree >>>.is-current .el-tree-node__label{
    color: #409EFF;
    font-weight: 700;
  }
  .el-tree >>>.is-current .el-tree-node__children .el-tree-node__label{
    color:#606266;
    font-weight: normal;
  }
  .selectInput{
    padding: 0 5px;
    box-sizing: border-box;
  }

  /* 开发禁用 */
  /* .el-tree-node:focus>.el-tree-node__content{
    background-color:transparent;
    background-color: #f5f7fa;
    color: #c0c4cc;
    cursor: not-allowed;
  }
  .el-tree-node__content:hover{
    background-color: #f5f7fa;
  } */
</style>
